I bought a TFO set (TG131GT1) for my Glock 19 just for the front sight. it's currently mounted with an AmeriGlo rear (GL-405L), I like the setup but unfortunately the rear sight is too low (or front sight is too high) and the gun is shooting low if I line it up properly.

anyone with experience or have a caliper and a set of the TFO sights mounted that could measure the rears? would a GL-406L be a better match or do I need to go even higher? there doesn't seem to be much info about using the TFO fronts with different rears, either that or my Google-fu sucks this morning.

I'm tempted to just ditch the setup and go with a packaged set like the Hacks or Defoor but would be nice to get this TFO frankenstein working.

Did you shoot this gun to POA before the sight change? If yes, tell us how far away the target was and how low you were shooting. I saw a formula to calculate sight height on another forum. I'll see if I can find it.

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Now to order a front sight the correct height, You measure the height of the front sight on your rifle from the bottom of the dovetail to the top of the sight, add the change calculated above and ask for that height. Use a caliper or micrometer to measure with since you need to have an answer in thousands of an inch.

It is important to note that front sights adjust the opposite direction you want to move the point of impact. In the example above we were shooting high so we needed a taller front sight. If we were shooting low we would want a shorter front sight.

Rear sights adjust in the direction we want the move the point of impact. If we want to move the point of impact to the left we move the rear sight to the left.

I'm subscribed to this thread, so just post up your info and I can give you a hand with the calculations.

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well, that's pretty interesting. I have a few pics archived from my cell phone, will need to dig them out and see if I can figure it out.

still, would be interesting to know what the technical/theoretical 25y zero rear is for the TFO front. as I'm a fairly new shooter, not yet 100% confident in my ability, if I figured it out this way there maybe some lingering doubt if I'm still not shooting bulls after a swap.

another forum suggested this tool, similar results I would imagine...
[url]http://www.ameriglo.net/sights/calculator[/url]

TFO = .195 high front sight (measured from top of slide to the top of the sight), needs at least .286 - .294 rear total height (measured from the bottom of the dovetail to the top of the sight shoulders).

I got a .272 high http://www.ameriglo.net/sites/defaul...s/gl405pra.jpg (Ameriglo 406 PRA), so I'm .015 low, and I've been shooting a few inches low at 25 yards. (Previously at 6" groups at 25 yards with TFOs front & rear). I tested at 3 - 10 yards and it was consistently a little low there too. You are shooting the GL-205L which is .256 high. That puts you low at a difference of .030 That's double my deficit, so I can imagine you'd be hitting quite low (given your grip, stance, distance, and ammo load have been consistent).

Love the TFO, but it has come lose, even with loctite (blue) and I'm seriously considering whether or not the fiber optic bonus will really come in all that helpful for my needs. If I found myself doing more outdoor competition stuff, It would rock. But as an indoor defensive handgun set-up for low light, it's really the wider .180 rear notch that allows easy and fast front sight acquisition from the silhouette of a tac-light that is key. Under those conditions, I've tested and tested, and it's the very rare light condition that I can even make use of the tritium. It's all about the sight picture, sights silhouetted by your light source, and consistent weapon presentation (especially for home defense & CQB).

That brings up a point though,...will a .015 low rear sight really matter that much at close distances? Probably not. But, given that under stress, the best you can hope for is the worst you do in training, I'd want my weapon system to be as dialed-in as possible leaving the very least room for mechanical error (that's why we have Glock's in the first place, no?).

The TFO front has great features, but the rear, I find too busy and the notch too narrow for my liking.
Ameriglo, Warren, Trij, all make great "u" type notches for faster targeting.
It's just been a tough search to find a set-up that does it all.
Even using a Trijicon RMR would have its drawbacks.

This set up seems like it would offer:
1. Fast target acquisition with a larger rear notch
2. Clear silhouette of the sight picture when using a tac-light at night
3. Brightly colored front sight for daylight conditions, or when shooting against a darker-colored target
4. Tritium just in case the twilight conditions are present
5. "Straight-8" type dot sighting for vertical alignment if needed

Another plus for Ameriglo is the flat front face of the rear site that lends itself to easily running single hand racking and clearing manipulations off your belt, holster, or a table. Rear sights with slants (Heinie, Warren, Truglo, Novak) make that much more difficult. In fact Rob Pincus just designed a new rear sight with Ameriglo for that very purpose called the "Claw" http://clawrearsight.com/

I'm not sure if this will be viewable, but is what my set up looks like now:
[url]https://mail-attachment.googleusercontent.com/attachment/u/1/?ui=2&ik=5b48cea6bf&view=att&th=13a48258fa1e783a&attid=0.2&disp=inline&realattid=1414752340172341248-2&safe=1&zw&saduie=AG9B_P8ADWNFnsEzZoL8JLWQs1JO&sadet=1350518984337&sads=1iI_zfOjESkaCQvc9ODEKjaD9 7g[/url]

link is't working.

so I got tired of playing the guessing game and decided to get another AmeriGlo front that would match the rear. went with the CAP green/green front. on a related note I have a set of Glock low TFOs for sale (; here's a pic for size comparison...

Here is the painted TFO with green nail polish - we'll see if it stays on.
(rear site focus):
(front site focus):
The front site is actually brighter in daylight, plus the fiber optic shines in the middle. It wasn't easy to capture it with the camera (plus it was against a white/neutral background). With overhead / ambient light, you can't miss it. Kinda like the CAPS. Plus, it also is fiber optic, and tritium for twilight acquisition. We'll see if it still shoots low with the aro-tek 'ghost' ring (not actually a ghost ring, more like the hexsite).

Side view - incredibly easy to do one hand racking manipulations off of any surface with such a high rear ring. Plus, it's rounded and won't snag on anything, and still fit in any holster...and requires no batteries.

I only shot at 21', but considered this an adequate first test since this is for a home defense weapon. The furthest possible engagement in my home would be about 25 yards in the extreme, but close quarters is more likely.

I shot both 40S&W and 9mm (I have a Lone Wolf drop-in barrel), both using CCI Speer Gold-Dot JHP defensive ammo.

Initially with steady accurate fire (not a defensive scenario), it was pretty easy to maintain a 2-3" group. When playing with sight picture (center at top of front sight, center behind front sight, front sight focus, target focus, etc)...the group grew to about 5" plus a flyer or two with rapid double taps with the 40S&W recoil.

I'm gonna try again at an indoor range from 3 yards out to 25 yards in low light with the taclight on and see what I can reproduce. If it remains like this, I'll leave it as is. If not, I might replace the front sight with an Arotek.